40 Chain Links | McMaster-Carr

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Roller Chain Trade Number

Link Type

Adding and Connecting

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Material

Component

Pitch

Chain Style

Roller Chain Type

Attachment Type

Roller Width

Length

Roller Diameter

Roller Chain Attachment Style

Chain Standard

Chain Pitch Type

Finish

Corrosion-Resistant Coated

Pin Diameter

Tab Length

DFARS Specialty Metals

Exempt

Working Load

Less than 1,000 lb.

Mounting Hole Diameter

RoHS

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Export Control Classification Number (ECCN)

Pinhole Diameter

Tab Width

94 Products

Roller Chain and Links

Connecting Links

Adding Links

Adding-and-Connecting

Links

Image of Attribute. Front orientation. Contains Annotated.

Pair this chain with sprockets to transmit power between rotating shafts. Like the chain on a bike, the side plates have a figure-eight shape that grips the sprockets without slipping.

Lubrication is key to smooth operation and long chain life. Routinely apply oil by hand or install an oil dispenser for continuous lubrication.

Steel—The go-to for roller chain, steel is strong and economical. While proper lubrication helps prevent rusting, it’s not as corrosion resistant as coated or stainless steel.

Corrosion-Resistant-Coated Steel—Combines the strength of steel with the corrosion resistance of stainless steel. The coating has been tested to withstand 500 hours of salt spray, so it holds up well in wet and outdoor conditions.

Corrosion-Resistant 304 Stainless Steel—Won't corrode from frequent washdowns and mild chemicals, including ammonia often found in cleaning solutions.

Highly-Corrosion-Resistant 316 Stainless Steel—Our most corrosion resistant roller chain won’t degrade when exposed to salt water and harsh chemicals.

Connecting Link—Use a single link to join both ends of your chain. Start by removing the spring clip from the link’s side plate. Then, slide the link pins into the mating rollers at each end of your chain and snap the clip back on. Also known as master links.

Adding Link—Attach with a connecting link to extend the length of your chain. Each link adds a length equal to the chain’s pitch. Also known as roller links.

Adding-and-Connecting Link—An all-in-one link for adding and connecting. It adds a half-pitch length at the roller end, allowing finer length adjustments than full-pitch links. The pin end connects to your chain—except for trade number 25, which requires a separate connecting link. Remove the side plate to install. Also known as half links and offset links.

	Roller Chain						Connecting Links		Adding Links		Adding-and-Connecting Links
	Trade No.	Std.	Pitch	Roller Dia.	Roller Wd.	Working Load, lb.		Each		Each		Each
Single Strand







				Steel

				40	ANSI	1/2"	0.312"	5/16"	940	00000000	00000	00000000	00000	00000000	00000




						Corrosion-Resistant-Coated Steel

						40	ANSI	1/2"	0.312"	5/16"	940	00000000	0000	00000000	0000	00000000	0000




								Corrosion-Resistant 304 Stainless Steel

								40	ANSI	1/2"	0.312"	5/16"	95	0000000	0000	0000000	0000	0000000	00000




										Highly-Corrosion-Resistant 316 Stainless Steel

										40	ANSI	1/2"	0.312"	5/16"	95	0000000	00000	———	0	0000000	00000

Attachment Roller Chain Links


Connecting Link A-1 Attachment	Connecting Link AA-1 Attachment	Connecting Link K-1 Attachment	Connecting Link KK-1 Attachment

Connecting Link SA-1 Attachment	Connecting Link SK-1 Attachment	Connecting Link WA-2 Attachment	Connecting Link WK-2 Attachment

Connecting Link WSA-2 Attachment	Connecting Link WSK-2 Attachment	Connecting Link D-1 Attachment	Connecting Link D-3 Attachment

Adding Link A-1 Attachment	Adding Link K-1 Attachment	Adding Link SA-1 Attachment	Adding Link SK-1 Attachment

Add these links to your roller chain to attach brackets and guides, move items directly, or trip switches in conveying, timing, and aligning setups. Like the chain on a bike, the side plates have a figure-eight shape that grips sprockets to transmit power between rotating shafts without slipping. We offer compatible chain for your convenience. When using your own chain, make sure the trade numbers match. Do not use these links with our Low-Maintenance Roller Chain.

Lubrication is key to smooth operation and long chain life. Routinely apply oil by hand or install an oil dispenser for continuous lubrication.

Steel—The go-to for roller chain, steel is strong and economical. While proper lubrication helps prevent rusting, it’s not as corrosion resistant as coated or stainless steel.

Adding Link—Attach with a connecting link to extend the length of your chain. Each link adds a length equal to the chain’s pitch. Also known as roller links.

Pin—The pins are extended to trip switches.

Tab—The tabs have holes to mount parts and hang hooks.

	Links												Chain
	Attachment		Roller Chain						Connecting Link		Adding Link
	Style	Type	Trade No.	Std.	Pitch	Roller Dia.	Roller Wd.	Working Load, lb.		Each		Each		Per Ft.
Steel



		A-1	Tab	40	ANSI	1/2"	0.312"	5/16"	940	000000	00000	000000	00000	00000000	00000


		AA-1	Tab	40	ANSI	1/2"	0.312"	5/16"	940	00000000	00000	———	0	00000000	0000
		K-1	Tab	40	ANSI	1/2"	0.312"	5/16"	940	000000	0000	000000	0000	00000000	0000
		KK-1	Tab	40	ANSI	1/2"	0.312"	5/16"	940	00000000	00000	———	0	00000000	0000
		SA-1	Tab	40	ANSI	1/2"	0.312"	5/16"	940	0000000	0000	0000000	0000	00000000	0000
		SK-1	Tab	40	ANSI	1/2"	0.312"	5/16"	940	0000000	0000	0000000	0000	00000000	0000
		WA-2	Tab	40	ANSI	1/2"	0.312"	5/16"	940	00000000	00000	———	0	00000000	0000
		WK-2	Tab	40	ANSI	1/2"	0.312"	5/16"	940	00000000	00000	———	0	00000000	0000
		WSA-2	Tab	40	ANSI	1/2"	0.312"	5/16"	940	00000000	00000	———	0	00000000	0000
		WSK-2	Tab	40	ANSI	1/2"	0.312"	5/16"	940	00000000	00000	———	0	00000000	0000
		D-1	Pin	40	ANSI	1/2"	0.312"	5/16"	940	0000000	0000	———	0	00000000	0000


		D-3	Pin	40	ANSI	1/2"	0.312"	5/16"	940	0000000	0000	———	0	00000000	0000


		Corrosion-Resistant-Coated Steel



				A-1	Tab	40	ANSI	1/2"	0.312"	5/16"	940	0000000	0000	———	0	000000	0000


				K-1	Tab	40	ANSI	1/2"	0.312"	5/16"	940	0000000	0000	———	0	000000	0000
				SA-1	Tab	40	ANSI	1/2"	0.312"	5/16"	940	0000000	0000	———	0	000000	0000
				SK-1	Tab	40	ANSI	1/2"	0.312"	5/16"	940	0000000	0000	———	0	000000	0000
				D-1	Pin	40	ANSI	1/2"	0.312"	5/16"	940	0000000	0000	———	0	000000	0000
				D-3	Pin	40	ANSI	1/2"	0.312"	5/16"	940	0000000	0000	———	0	000000	0000

Low-Maintenance Roller Chain and Links


Connecting Links	Adding-and-Connecting Links

Forget the mess and the stress, this chain has bearings that run reliably with little or no need for lubrication. Like the chain on a bike, the side plates have a figure-eight shape that grips sprockets to transmit power between rotating shafts without slipping.

Oil-Embedded Open Bearings—Made from porous bronze saturated with oil, these bearings don’t require lubrication.

Sealed Bearings—These bearings come with seals to retain the grease you add and reduce the need for additional lubrication. They also keep grease off your equipment and prevent dirt from sticking to the chain.

Steel—The go-to for roller chain, steel is strong and economical. It’s best for dry environments since moisture will cause it to rust.

Corrosion-Resistant Nickel-Plated Steel—A step up from plain steel, the nickel plating adds a layer of rust protection in wet environments. However, if scratched, the underlying steel may still rust. The plating may also hinder welding.

Adding-and-Connecting Link—An all-in-one link for adding and connecting. It adds a half-pitch length at the roller end, allowing finer length adjustments than full-pitch links. The pin end connects to your chain. Remove the side plate to install. Also known as half links and offset links.

	Roller Chain							Connecting Links		Adding-and-Connecting Links
	Trade No.	Std.	Pitch	Roller Dia.	Roller Wd.	Working Load, lb.	Lubrication		Each		Each
Oil-Embedded Open Bearings







				Steel

				40	ANSI	1/2"	0.312"	19/64"	810	Lubricated	00000000	00000	00000000	000000




						Corrosion-Resistant Nickel-Plated Steel

						40	ANSI	1/2"	0.312"	19/64"	680	Lubricated	0000000	0000	0000000	00000


						Sealed Bearings







										Steel

										40	ANSI	1/2"	0.312"	5/16"	830	Required	000000000	0000	000000000	00000

ANSI Roller Chain Spring Clips

Clip Shown

Installed

Replace lost or damaged spring clips to secure the pins on your connecting links. Face the opening away from the direction of travel to maintain a snug fit.

	Lg.	Ht.	Pkg. Qty.		Pkg.
Steel



	40	13/16"	5/16"	5	0000000	00000

Hollow-Pin Roller Chain and Links

Connecting Links

Adding-and-Connecting

Link

Slide rods or other attachments straight through the rollers. With hollow pins, there’s no need to take this chain apart or add attachment links like you would with standard roller chain. Pair the chain with sprockets to transmit power between rotating shafts. It’s commonly used in conveying applications.

Lubrication is key to smooth operation and long chain life. Routinely apply oil by hand or install an oil dispenser for continuous lubrication.

Steel—The go-to for roller chain, steel is strong and economical. While proper lubrication helps prevent rusting, it’s not as corrosion resistant as coated or stainless steel.

Corrosion-Resistant 304 Stainless Steel—Won't corrode from frequent washdowns and mild chemicals, including ammonia often found in cleaning solutions.

Adding-and-Connecting Link—An all-in-one link for adding and connecting. It adds a half-pitch length at the roller end, allowing finer length adjustments than full-pitch links. The pin end connects to your chain. Remove the side plate to install. Also known as half links and offset links.

	Roller Chain							Connecting Links		Adding-and-Connecting Links
	Trade No.	Std.	Pitch	Roller Dia.	Roller Wd.	Working Load, lb.	Pinhole Dia.		Each		Each
Single Strand







				Steel

				40	ANSI	1/2"	0.312"	5/16"	390	0.157"	00000000	00000	00000000	000000




						Corrosion-Resistant 304 Stainless Steel

						40	ANSI	1/2"	0.312"	5/16"	95	0.157"	0000000	00000	0000000	00000

Dry-Running Roller Chain and Links

Connecting Link

Say goodbye to messy grease and time-consuming maintenance. This chain has plastic bearings that run smoothly without lubrication. Paired with stainless steel pins and side plates, it’s lightweight, quiet-running, and resistant to mild chemicals. The chain withstands starts and stops better than all-plastic chain, but it handles only a fraction of the load of all-metal chain. Like the chain on a bike, the side plates have a figure-eight shape that grips sprockets to transmit power between rotating shafts without slipping.

	Roller Chain							Connecting Links
	Trade No.	Std.	Pitch	Roller Dia.	Roller Wd.	Working Load, lb.	Lubrication		Each
Single Strand







				Plastic with 304 Stainless Steel Pins and Side Plates

				40	ANSI	1/2"	0.312"	5/16"	95	Not Required	0000000	00000

Flexible Roller Chain and Links

Connecting Links

Thanks to extra space between components, this chain flexes side to side to take on misaligned sprockets or curved conveyor paths. Like the chain on a bike, the side plates have a figure-eight shape that grips sprockets to transmit power between rotating shafts without slipping. Also known as bow chain.

Lubrication is key to smooth operation and long chain life. Routinely apply oil by hand or install an oil dispenser for continuous lubrication.

Steel—The go-to for roller chain, steel is strong and economical. While proper lubrication helps prevent rusting, it’s not as corrosion resistant as coated or stainless steel.

	Roller Chain							Connecting Links
	Trade No.	Std.	Pitch	Roller Dia.	Roller Wd.	Working Load, lb.	Bend Radius		Each
Single Strand







				Steel

				40	ANSI	1/2"	0.312"	5/16"	400	13.78"	00000000	00000

Flat-Edge Roller Chain and Links

Connecting Links

Adding Links

No more hang-ups thanks to the flat, oblong side plates that create a level surface to keep items moving along conveyor lines. Unlike standard roller chain, there are no divots to snag products. Pair this chain with sprockets to transmit power between rotating shafts.

Lubrication is key to smooth operation and long chain life. Routinely apply oil by hand or install an oil dispenser for continuous lubrication.

Steel—The go-to for roller chain, steel is strong and economical. While proper lubrication helps prevent rusting, it’s not as corrosion resistant as coated or stainless steel.

Adding Link—Attach with a connecting link to extend the length of your chain. Each link adds a length equal to the chain’s pitch. Also known as roller links.

	Roller Chain						Connecting Links		Adding Links
	Trade No.	Std.	Pitch	Roller Dia.	Roller Wd.	Working Load, lb.		Each		Each
Single Pitch







				Steel

				40	ANSI	1/2"	0.312"	5/16"	930	0000000	00000	0000000	00000